Nested DataList Parent-Child Selection

I have a web application which have a datalist within a datalist. The outer datalist make parent items and the inner one the child items both with checkboxes for selection. I am retrieving these items from a database.

THE PROBLEM:

1. I want the parent item to be checked/unchecked automatically if any of the children is checked/unchecked.

2. All the children should be checked if the parent is checked.

I just dont know how to do this with datalists. Although, I have implemented this logic in my code by the use of flags and count variables but I want it to be visible to users. Shall i use javascripts for that? But keeping in mind tht scripting has issues with browsers. IE is recommended browser.

Many thanks.

Technology Used is .NET 4.

Below is the code I hv used for implementing this logic in C#.

bool flag;

bool Parentflag = false;

int count = 0;//count=1 means only parent exists, count=2 means parent+child exists

int labelID = 0;

using (SqlConnection sqlcon = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ToString()))

{

BLL.Admin adminObj = new BLL.Admin(sqlcon.ConnectionString);

adminObj.DeletePriorPermissions(DropDownRoles.SelectedValue.ToString());

foreach (DataListItem lstitem in dlstMenu.Items)

{

//Code for iterating Parent Menu Items

if (lstitem.ItemType == ListItemType.Item || lstitem.ItemType == ListItemType.AlternatingItem)

{

flag = false;

Label lblPageIdParent = (Label)lstitem.FindControl("lblPageId");

CheckBox chkPageCaption = (CheckBox)lstitem.FindControl("chkPageCaption");

labelID = Convert.ToInt32(lblPageIdParent.Text);

if (chkPageCaption.Checked)

//Add Permissions for Parent Page

{

adminObj.SavePagePermissions(1, Convert.ToInt32(lblPageIdParent.Text), DropDownRoles.SelectedValue.ToString());

Parentflag = false;

count = 1;

}

DataList dlstpage = (DataList)lstitem.FindControl("dlstpage");

foreach (DataListItem item in dlstpage.Items)

{

Parentflag = true;

if (item.ItemType == ListItemType.Item || item.ItemType == ListItemType.AlternatingItem)

{

//parent checkbox

CheckBox cbxPage = (CheckBox)item.FindControl("chkPageCaption");

RadioButtonList rdoPermissions = (RadioButtonList)item.FindControl("rdoPermission");

Label lblPageID = (Label)item.FindControl("lblPageId");

if (cbxPage != null)

{

if (cbxPage.Checked)

{

//Check parent if any of the children is checked.

if (!chkPageCaption.Checked)

{

//Save permissions for parent item only once.

if (!flag)

{

adminObj.SavePagePermissions(1, Convert.ToInt32(lblPageIdParent.Text), DropDownRoles.SelectedValue.ToString());

flag = true;

}

foreach (ListItem rdlst in rdoPermissions.Items)

{

if (rdlst.Selected)

{

//Save Permissions for child items.

adminObj.SavePagePermissions(Convert.ToInt32(rdlst.Value), Convert.ToInt32(lblPageID.Text), DropDownRoles.SelectedValue.ToString());

Parentflag = true;

count = 2;

}

//Delete entry for parent item if none of the children is selected.

if (count != 0)

{

if (Parentflag==true && count == 1)

adminObj.ExecuteSQL("DELETE FROM [tbl_PagePermissions] WHERE PAGEID = " + labelID + " AND ROLEID = '" + DropDownRoles.SelectedValue.ToString() + "'", sqlcon.ConnectionString);

}